JPS6228297Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sewing machine needle equipped with an upper sewing thread regulating function.

In conventional sewing machine needles, when the cloth feed direction is A, B, or C direction, as shown in Fig. 1, the second
A stitch can be formed using only the perfect stitch 22 as shown in the figure, but in the case of direction D, the upper stitch 21 is twisted once as shown in FIG. Sometimes. This hit stitch 23 is generated completely randomly.

The cause of the stitch configuration in which the upper sewing thread is twisted 211 times is explained with reference to FIG. 13.
When the fabric is fed in the direction D in FIG. 1 in a sewing machine having the above-mentioned sewing machine, when the upper sewing thread 21 is pulled around the left side of the needle 14, a stitch with 211 twists of the upper sewing thread is formed.

Furthermore, when the upper sewing thread 21 is pulled around the right side of the needle 14, a stitch without one twist is formed as shown in FIG. In addition, Fig. 1, Fig. 11, and Fig. 1
In Figure 3, 13 is a thread hole, and 15 is a long groove.

When the conventional needle 14 is used and the fabric is fed in the direction D in Figure 1, the upper sewing thread 21 wraps around the needle 14 to the left and right at random, resulting in an unsightly sewing thread configuration as shown in Figure 3. It will be.

The object of the present invention is to eliminate the above-mentioned conventional drawbacks and to provide a sewing machine needle that can produce beautiful sewn products with uniform stitches at a low cost.

An embodiment of the present invention is shown in Figs. 4, 5, and 6.
To explain with reference to FIGS. 10 and 11, the needle tip 1 is formed to coincide with the needle shaft center line 2, and the thread hole 3 provided near the needle tip 1 is aligned with the needle shaft center line 2. 2, a long groove 5 is formed on the front side of the needle 4 along the needle axis center line 2, and a short groove 6 is formed on the back side of the needle 4 near the thread hole 3.

Therefore, the cross-sectional shape from the thread hole 3 to the needle tip 1 is elliptical (more precisely, the link lines of the cross-section form part of the circumferential line of the ellipse). , the straight line 7 connecting the two foci of the ellipse is
A straight line 9 perpendicular to the thread hole center line 8 and the needle shaft center line 2
The lower end 6' of the short groove 6 is a plane that includes the needle shaft center line 2 and the thread hole center line 8 when the needle 4 is viewed from the back side. 11, and is further inclined so that the side where the lower end 6' of the short groove 6 is located is lower.

The long groove 5 is provided to extend below the thread hole 3, that is, near the needle tip 1, and its lower end 5' is offset to the left with respect to the plane 11 when the needle 4 is viewed from the front side. There is.

Note that the cross-section line 6'' of the short groove 6 is parallel to the straight line 7, and the cross-section line 5'' of the lower end 5' of the long groove 5 is parallel to the plane 10. , link lines 5″ and 6″ are both plane 1
It may be parallel to 0. In FIG. 6, 4' is a line connecting the handle of the needle 4.

In the sewing machine needle configured in this way, when the fabric is fed in the direction D in FIG. 1, the way the top sewing thread 21 is pulled against the needle tip 1 is as shown in FIG. When looking at 4 from the front side,
It will pass to the right of needle 4. Therefore, when this sewing machine needle is used in a sewing machine having a counterclockwise hook 24, it is possible to form a stitch using only the perfect stitch 22, as shown in FIG.

As mentioned above, by making the cross-sectional shape from the thread hole 3 to the needle tip 1 into an elliptical shape, and by making the straight line 7 connecting the two focal points inclined with respect to the plane 10, the thread of the upper sewing thread The road regulation function will be significantly more effective.

Next, FIG. 7, FIG. 8, FIG. 9, FIG. 12, and FIG. 13 show other embodiments of the present invention; As is clear from a comparison between the example shown in FIG. Therefore, when the fabric is fed in the D direction, the upper sewing thread 2
The way in which the upper sewing thread 21 is pulled against the needle tip 1 is as shown in FIG. 12, and the upper sewing thread 21 passes through the left side of the needle 4 when the needle 4 is viewed from the front side. As a result, when this sewing machine needle is used in a sewing machine having a counterclockwise hook 24, it is possible to form stitches using only the hit stitches 23 as shown in FIG.

It is clear from the above description that when the sewing machine needles shown in the examples in Figures 4 and 7 are used in a sewing machine with a clockwise hook, the stitch configurations will be as shown in Figures 13 and 11, respectively. Probably.

As described above, the present invention makes the cross section of the needle from the needle hole to the needle tip into an inclined elliptical shape, and the lower end of the short groove on the opposite side of the long groove is positioned to the right or left of the center of the needle. This sewing machine needle is characterized by being biased to one side, has an excellent thread path regulation function, and has the effect of guiding and regulating the upper sewing thread smoothly and reliably along the long groove and short groove. Therefore, the sewing machine needle of the present invention By selecting the combination of the kettle and the kettle, it is possible to consistently and stably form seams using only perfect stitches or only hitch stitches, resulting in uniform and visually beautiful sewn products. There are practical benefits such as the needle shape is simple and can be manufactured at low cost.

[Brief explanation of the drawing]

1 to 3 show a conventional example, FIG. 1 is an explanatory diagram of the cloth feeding direction, and FIG. 2 is a front view showing the seam configuration state when the cloth feeding direction is other than direction D in FIG. 1. , FIG. 3 is a front view showing the seam configuration when the cloth feed direction is the D direction, FIG. 4 is a rear view of the main part of an embodiment of the present invention, FIG. 5 is a front view thereof, and FIG. 6 is a sectional view taken along the line A-A in FIG. 4, FIG. 7 is a rear view of main parts of another embodiment, FIG. 8 is a front view thereof, and FIG.
The cross-sectional view taken along the line B-B in FIG.
The figure is a front view showing the regulation state of the upper sewing thread in the example shown in Fig. 4, Fig. 11 is a front view showing the stitch configuration state thereof, and Fig. 12 is a front view showing the regulation state of the upper sewing thread in the example shown in Fig. 7. 13 are front views showing the state of the seam structure. 1... Needle tip, 2... Needle shaft center line, 3... Thread hole, 4... Needle, 5... Long groove, 5'... Lower end,
5″...Link line, 6...Short groove, 6'...Lower end, 6''...Link line, 8...Thread hole center line, 2
1...Top stitch, 22...Perfect stitch,
23...Hitsutistutetsuchi.

Claims (1)

[Claims for Utility Model Registration] 1. The needle tip 1 is formed to coincide with the needle shaft center line 2, and the thread hole 3 provided near the needle tip 1 is orthogonal to the needle shaft center line 2, A long groove 5 is provided on the front side of the needle 4 along the needle axis center line 2, a short groove 6 is provided near the thread hole 3 on the back side of the needle 4, and a cross section from the thread hole 3 to the needle tip 1 is provided. The shape is elliptical, and the straight line 7 connecting the two focal points is inclined with respect to the straight line 9 perpendicular to the thread hole center line 8 and the plane 10 including the needle axis center line 2, and A sewing machine needle characterized in that a lower end 6' of the groove 6 is shifted to one side with respect to a plane 11 including the needle shaft center line 2 and the thread hole center line 8. 2. The sewing machine needle according to claim 1, wherein the bottom surface of the short groove 6 is sloped with the side where the lower end 6' is lowered. 3. The sewing machine needle according to claim 2, in which the cross section of the short groove 6 has a link line 6'' parallel to the straight line 7. 4. A cross section from the thread hole 3 to the needle tip 1. The surface shape is an ellipse in which the straight line 7 is inclined upward to the left with respect to the plane 10, and the lower end 6' of the short groove 6 is oriented to the left with respect to the plane 11 when the needle 4 is viewed from the back side. A sewing machine needle according to claim 2 or 3 of the claims for registration of a utility model that is shifted to one side. Utility model registration claims 2 or 3, in which the needle 4 has an slanted elliptical shape, and the lower end 6' of the short groove 6 is shifted to the right side with respect to the plane 11 when the needle 4 is viewed from the back side. Sewing machine needle as described in 6. Utility model registration in which the long groove 5 is extended to the vicinity of the needle tip 1 and the lower end 5' is shifted to the left side with respect to the plane 11 when the needle 4 is viewed from the front side. 7. The sewing machine needle according to claim 4. 7. The long groove 5 is extended to the vicinity of the needle tip portion 1, and the lower end portion 5' thereof is on the right side with respect to the plane 11 when the needle 4 is viewed from the front side. A sewing machine needle according to claim 5 of the offset utility model registration claim.